WO2011115230A1 - 高密度汚泥生成型水処理装置の立上げ方法 - Google Patents

高密度汚泥生成型水処理装置の立上げ方法 Download PDF

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Publication number
WO2011115230A1
WO2011115230A1 PCT/JP2011/056477 JP2011056477W WO2011115230A1 WO 2011115230 A1 WO2011115230 A1 WO 2011115230A1 JP 2011056477 W JP2011056477 W JP 2011056477W WO 2011115230 A1 WO2011115230 A1 WO 2011115230A1
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Prior art keywords
sludge
tank
density
volume ratio
separated
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PCT/JP2011/056477
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English (en)
French (fr)
Japanese (ja)
Inventor
一樹 林
悟 長井
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栗田工業株式会社
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Priority to CN201180014314.1A priority Critical patent/CN102803155B/zh
Priority to KR1020127021347A priority patent/KR101442937B1/ko
Priority to JP2012505755A priority patent/JP5700036B2/ja
Publication of WO2011115230A1 publication Critical patent/WO2011115230A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/62—Heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/06—Sludge reduction, e.g. by lysis

Definitions

  • the present invention relates to a method for starting up a high-density sludge-generating water treatment apparatus.
  • High-density sludge (High Density Solids) sludge) produced by a metal hydroxide precipitation reaction by a neutralization reaction has attracted attention.
  • High density sludge is rich in sedimentation and dewaterability and is considered useful for volume reduction of sludge.
  • High density sludge is generally generated by the following method. That is, raw water containing inorganic ions such as aluminum ions is sequentially treated in an insolubilization treatment tank and a coagulation sedimentation tank, and the separated sludge obtained in the coagulation sedimentation tank is supplied to the sludge reforming tank.
  • the adsorbed sludge is generated by adsorbing alkali to the separated sludge, and then the adsorbed sludge is brought into contact with inorganic ions in the inorganic waste water to form an insolubilized material on the surface of the adsorbed sludge. In this way, high-density sludge is generated during raw water treatment.
  • a water treatment device capable of producing high-density sludge (hereinafter referred to as a “high-density sludge-generating water treatment device”) will be newly established, as well as coagulation sedimentation. It is also conceivable to switch the existing water treatment device including the tank to a high-density sludge generation type water treatment device by remodeling. At this time, when raw water supply is started to the high-density sludge generation type water treatment device, especially when the existing water treatment device is switched to the high-density sludge generation type water treatment device, the factory that discharges the raw water is fully operational.
  • the flow rate of raw water and the concentration of inorganic ions are often high. Therefore, it is extremely important to start up the high-density sludge generation type water treatment device in a short period of time, that is, to increase the density of the high-density sludge in a short period of time in the high-density sludge generation type water treatment device.
  • Patent Document 1 As a method for increasing the concentration of high-density sludge in a short period of time in a high-density sludge-generating water treatment apparatus, a method described in Patent Document 1 below is known.
  • a reaction tank corresponding to an insolubilization treatment tank
  • a compound containing an inorganic ion source and an insolubilizing agent are added to the reaction tank, and sludge is not discharged and solidified. It has been proposed to start up a water treatment apparatus in a short period of time by accumulating sludge in a liquid separation tank and ensuring sufficient sludge as seed crystals before supplying raw water to a reaction tank.
  • Patent Document 1 still has room for improvement from the viewpoint of shortening the startup period of the high-density sludge-generating water treatment apparatus.
  • This invention is made
  • the present inventors in the initial stage of startup, by controlling the volume ratio of the separated sludge area in the solid-liquid separation tank to be below a certain value, It has been found that the above problems can be solved, and the present invention has been completed.
  • the present invention includes an insolubilization treatment tank that insolubilizes inorganic ions in the inorganic ion-containing wastewater to be introduced, and a precipitation tank that settles and separates discharged water introduced from the insolubilization treatment tank into treated water and separated sludge.
  • High density sludge is produced by repeating a series of steps including an adsorbed sludge producing step of adsorbing the counter ion-containing substance onto the surface of the introduced separated sludge to produce adsorbed sludge.
  • the low density sludge in the device is obtained by repeating the series of steps.
  • a high-density sludge generation step for generating a high-density sludge, and during the high-density sludge generation step, a region below the liquid level of the liquid in the settling tank in the settling tank (liquid area in the tank)
  • a high-density sludge generation type water treatment device comprising a control step of controlling so that the volume ratio of sludge, which is the volume ratio of the area below the sludge interface (separated sludge area) to the volume, is 30 vol% or less. It is a startup method.
  • wastewater containing inorganic ions is introduced into the insolubilization treatment tank.
  • the counter-ion-containing substance is supplied to the sludge reforming tank by the counter-ion-containing substance supply means, the counter-ion-containing substance is adsorbed on the surface of the separated sludge and the adsorbed sludge is generated. It is supplied from the mass tank to the insolubilization processing tank.
  • the inorganic ions in the inorganic ion-containing wastewater react with the counter ions of the adsorbed sludge and are insolubilized.
  • the discharged water from an insolubilization processing tank is introduced into a sedimentation tank, and is settled and separated into separated sludge and treated water.
  • the separated sludge is supplied from the sedimentation tank to the sludge reforming tank via the separated sludge supply line, and the adsorbed sludge is generated in the sludge reforming tank as described above, and this adsorbed sludge is converted into the sludge reforming tank. Is supplied to the insolubilization treatment tank. In this way, a high-density sludge is produced
  • the sludge volume ratio which is the ratio of the volume of the separated sludge area to the volume of the liquid area in the tank, is controlled to be 30 vol% or less.
  • the start-up method of the high-density sludge generation type water treatment device of the present invention it becomes possible to generate high-density sludge sufficiently in a short period of time, and as a result, the concentration of the high-density sludge can be reduced in a short period of time. It becomes possible to raise. That is, it is possible to start up the high-density sludge-generating water treatment device in a short period of time. As a result, the main operation after startup can be performed at an early stage.
  • the sludge volume ratio it is preferable to control the sludge volume ratio to be 4 to 30 vol%.
  • the start-up method further includes a wastewater introduction step of introducing the inorganic ion-containing wastewater into the insolubilization treatment tank, and a treated water discharge step of discharging treated water obtained by sedimentation separation in the settling tank, This is particularly useful when the inorganic ion-containing wastewater is factory wastewater.
  • the concentration ratio R is a ratio calculated as a ratio of the volume of the sludge area in the measuring cylinder (capacity of the sludge area after standing for 24 hours / volume of the sludge area before standing for 24 hours).
  • the high density sludge in the present invention means that C2 is 150 g / L or more when the inorganic ions are Al 3+ , Fe 2+ , Fe 3+ , Cr 2+ , F ⁇ , PO 4 2 ⁇ or SO 4 2 ⁇ .
  • Such sludge is indicated, and when the inorganic ions are Cu 2+ , Mn 2+ , Ni 2+ or Zn 2+ , the sludge is indicated such that C2 is 50 g / L or more.
  • the unit of the sludge concentration may be wt% instead of g / L.
  • the high-density sludge in the present invention is C2 of 15 wt% or more when the inorganic ions are Al 3+ , Fe 2+ , Fe 3+ , Cr 2+ , F ⁇ , PO 4 2 ⁇ or SO 4 2 ⁇ .
  • the sludge is such that C2 is 5 wt% or more. Further, sludge that does not satisfy the above conditions is defined as low density sludge.
  • the high-density sludge generation type water treatment device of the present invention can be started up in a short period of time.
  • FIG. 1 is a flowchart showing an example of a high-density sludge-generating water treatment device for implementing the method for starting up a high-density sludge-generating water treatment device according to the present invention.
  • the high-density sludge-generating water treatment apparatus includes a first insolubilization treatment tank 1, a second insolubilization treatment tank 2, a coagulation treatment tank 3, a precipitation tank 4, and a sludge reforming tank 5. It has.
  • the first insolubilization treatment tank 1 is connected to an introduction line L1 for introducing inorganic ion-containing wastewater containing inorganic ions, and the first insolubilization treatment tank 1 and the second insolubilization treatment tank 2 are connected by an intermediate line L2.
  • the second insolubilization treatment tank 2 and the aggregation treatment tank 3 are connected by an intermediate line L3, and the aggregation treatment tank 3 and the precipitation tank 4 are connected by an intermediate line L4.
  • the sedimentation tank 4 and the sludge reforming tank 5 are connected by a separated sludge supply line L5 that supplies the separated sludge 11 obtained in the sedimentation tank 4 to the sludge reforming tank 5, and the sludge reforming tank 5 and the first insolubilization treatment are performed.
  • the tank 1 is connected by an adsorbed sludge supply line L11 that supplies the adsorbed sludge obtained in the sludge reforming tank 5 to the first insolubilization treatment tank 1.
  • a treated water discharge line L7 for discharging treated water is connected to the settling tank 4, and a sludge discharge line L6 for discharging the separated sludge 11 obtained in the settling tank 4 is branched from the separated sludge supply line L5. .
  • the separated sludge supply line L5 is provided with a sludge supply pump P2, a flow meter 6 and a sludge concentration meter 7, and the sludge discharge line L6 is provided with a sludge pump P1.
  • the sludge supply pump P2 and the sludge concentration meter 7 are electrically connected. Based on the sludge concentration measured by the sludge concentration meter 7, the sludge supply pump P2 supplies the separated sludge 11 to the sludge reforming tank 5. The supply amount can be controlled.
  • a pH adjuster supply tank 8 is connected to the first insolubilization treatment tank 1 via a line L8, and a pH adjuster supply tank 9 is connected to the second insolubilization treatment tank 2 via a line L9.
  • a flocculant supply tank 10 is connected to the tank 3 via a line L10.
  • a counter ion-containing substance including a counter ion that forms an insolubilized product with inorganic ions via a line L12 in which a valve V1 is installed.
  • a counter ion-containing substance supply unit is configured by the valve V1 and the line L12.
  • the operation method includes a main operation process and a start-up process performed before that.
  • the start-up process of the high-density sludge generation type water treatment device will be described.
  • a case where the high-density sludge-generating water treatment apparatus is newly installed with the establishment of a factory that discharges inorganic ion-containing wastewater will be described as an example.
  • the start-up process includes a sludge accumulation process performed after start-up and a high-density sludge generation process that generates high-density sludge performed thereafter.
  • inorganic ion-containing wastewater for example, factory wastewater
  • inorganic ions in the inorganic ion-containing wastewater may be any of metal ions, fluorine ions, phosphate ions, sulfate ions, sulfite ions, and carbonate ions, for example.
  • metal ions include heavy metal ions such as Fe 2+ , Fe 3+ , Cu 2+ , Mn 2+ , Cr 2+ , Co 2+ , Ni 2+ , Zn 2+ , and Cd 2+, and light metal ions such as Mg 3+ and Al 3+. It is done.
  • the pH adjusting agent is supplied to the first insolubilizing treatment tank 1 from the pH adjusting agent supply tank 8 via the line L8 in order to cause sludge to aggregate in the aggregation treatment tank 3.
  • the pH of the liquid in the first insolubilization treatment tank 1 is usually adjusted appropriately within the range of pH 4-12. The pH at this time varies depending on the insolubilized product produced.
  • the pH adjuster for example, caustic soda, sulfuric acid, hydrochloric acid or the like is used.
  • the discharged water from the first insolubilization treatment tank 1 is introduced into the second insolubilization treatment tank 2 through the intermediate line L2.
  • the second insolubilization treatment tank 2 is supplied with a pH adjusting agent from the pH adjusting agent supply tank 9 via the line L9 in order to cause sludge to coagulate in the aggregation treatment tank 3.
  • the pH of the liquid in the second insolubilization treatment tank 2 is normally adjusted to a predetermined range of pH 4 to 12 as in the first insolubilization treatment tank 1. The pH at this time varies depending on the insolubilized product produced.
  • Al 3+ , Fe 3+ , F ⁇ , SO 4 2 ⁇ have pH 6.0 to 8.0, Cr 2+ , Cu 2+ , Mn 2+ , Ni 2+ , Zn 2+ have pH 9.5 to 11.0, PO 4 ⁇ Is adjusted in the range of pH 9.0 to 10.0.
  • the pH adjuster caustic soda, sulfuric acid and the like can be used as in the first insolubilization treatment tank 1.
  • the discharged water from the second insolubilization treatment tank 2 is introduced into the aggregation treatment tank 3 via the intermediate line L3.
  • the aggregating treatment tank 3 is supplied with the aggregating agent from the aggregating agent supply tank 10 via the line L10.
  • the flocculant is not particularly limited as long as it has an aggregating function, but a polymer flocculant is generally used.
  • a polymer flocculant any of nonionic polymer flocculants, anionic polymer flocculants, and cationic polymer flocculants can be applied.
  • the inorganic ion-containing wastewater is aluminum ion-containing wastewater
  • Nonionic polymer flocculants and anionic polymer flocculants are effective as the polymer flocculants.
  • the discharged water from the flocculation treatment tank 3 is introduced into the settling tank 4 through the intermediate line L4, and is settled and separated into the treated water and the separated sludge 11 in the settling tank 4 (settling separation step).
  • the treated water is discharged from the settling tank 4 through the treated water discharge line L7 (treated water discharge step).
  • a high-density sludge generation type water treatment device is newly installed along with the establishment of a factory for discharging inorganic ion-containing wastewater. For this reason, for a while after starting the production of high-density sludge, the factory has just been newly established, and the flow rate of inorganic ion-containing wastewater discharged from the factory and the concentration of inorganic ions are also small. For this reason, in the sedimentation tank 4, there exists almost no separation sludge 11. FIG. For this reason, the separated sludge 11 is accumulated without operating the sludge pump P1 for a while.
  • the region (separated sludge region) R2 below the sludge interface S in the sedimentation tank 4 with respect to the volume of the region (tank liquid region) R1 below the liquid level of the liquid in the sedimentation tank 4 is set.
  • the volume ratio (hereinafter referred to as “sludge volume ratio”) is measured (see FIG. 2).
  • the sludge interface S refers to the uppermost surface of the separated sludge region R2, and the separated sludge region R2 contains the separated sludge 11.
  • the sludge volume ratio can be determined as follows. That is, first, the relationship between the volume of the in-vessel liquid region R1 of the settling tank 4 and the position of the water surface of the in-vat liquid on the inner wall surface of the settling tank 4 is confirmed in advance. If this relationship is confirmed, the sludge volume ratio is determined by confirming the position of the sludge interface S of the separated sludge region R2 in the tank liquid and the position of the liquid level L of the tank liquid. Can do. The position of the sludge interface S in the separated sludge region R2 can be confirmed by, for example, a sludge interface meter (not shown) installed in the settling tank 4.
  • a sludge circulation process that is, a high-density sludge generation process is started.
  • the separated sludge 11 from the sedimentation tank 4 is supplied to the sludge reforming tank 5 via the separated sludge supply line L5 by the sludge supply pump P2 (separated sludge supply process).
  • the separated sludge 11 may be supplied to at least a part of the sludge reforming tank 5, and may be supplied as a part or all as required.
  • the counter ion-containing substance is introduced into the sludge reforming tank 5 from the counter ion-containing substance supply tank (not shown) via the line L12. Thereby, the counter ions in the counter ion-containing substance are adsorbed on the surface of the separated sludge 11 introduced into the sludge reforming tank 5 to generate adsorbed sludge (adsorbed sludge generating step).
  • the counter ion-containing material only needs to contain a counter ion capable of forming an insolubilized material with inorganic ions.
  • the inorganic ion is, for example, a metal ion
  • a hydroxide ion is used as the counter ion.
  • the counter ion-containing substance a substance containing hydroxide ions such as Ca (OH) 2 or NaOH can be used.
  • a substance containing chloride ions for example, CaCl 2 can be used.
  • the inorganic ion is a fluorine ion
  • Ca 2+ or the like can be used as a counter ion in addition to a hydroxide ion.
  • the inorganic ions are phosphate ions, sulfate ions, sulfite ions, Fe 2+ , Fe 3+, Ca 2+ or the like can be used.
  • the adsorption sludge thus generated is supplied from the sludge reforming tank 5 to the first insolubilization treatment tank 1 via the adsorption sludge supply line L11. And in the 1st insolubilization processing tank 1, an inorganic type ion containing waste water and adsorption sludge are made to contact. Thereby, the inorganic ion in the inorganic ion-containing wastewater is reacted with the counter ion of the adsorbed sludge to be insolubilized (insolubilization step).
  • the pH of the liquid in the first insolubilization treatment tank 1 varies depending on the insolubilized product to be generated, and is usually appropriately within a predetermined range of pH 4 to 12. Adjusted.
  • the pH can be adjusted by supplying the pH adjusting agent from the pH adjusting agent supply tank 8 via the line L8 as described above.
  • the pH adjuster the above-mentioned caustic soda, sulfuric acid, hydrochloric acid and the like are used.
  • the discharged water from the first insolubilization treatment tank 1 is introduced into the second insolubilization treatment tank 2 through the intermediate line L2.
  • the second insolubilization treatment tank 2 is supplied with the pH adjuster from the pH adjuster supply tank 9 via the line L9.
  • the pH of the liquid in the second insolubilization treatment tank 2 is usually adjusted to a predetermined range of pH 4 to 12 according to the insolubilized treatment product to be produced, as in the first insolubilization treatment tank 1.
  • the pH adjuster the above-mentioned caustic soda, sulfuric acid and the like can be used.
  • the discharged water from the second insolubilization treatment tank 2 is introduced into the aggregation treatment tank 3 via the intermediate line L3.
  • the aggregating treatment tank 3 is supplied with the aggregating agent from the aggregating agent supply tank 10 via the line L10.
  • the flocculant the above-mentioned flocculants are used.
  • the discharged water from the flocculation treatment tank 3 is introduced into the settling tank 4 through the intermediate line L4, and is settled and separated into the treated water and the separated sludge 11 in the settling tank 4 (settling separation step).
  • the treated water is discharged from the settling tank 4 through the treated water discharge line L7 (treated water discharge step).
  • the separated sludge 11 from the sedimentation tank 4 is supplied to the sludge reforming tank 5 via the separated sludge supply line L5 by the sludge supply pump P2 (separated sludge supply process).
  • High density sludge is generated by repeating the above series of steps.
  • control target value is set so that the sludge volume ratio is 30 vol% or less, and control is started (see FIG. 2).
  • a predetermined value is determined in the range of 5 to 15 vol% in advance, and the subsequent steps differ depending on whether the control target value of the sludge volume ratio is smaller than, equal to, or larger than the predetermined value.
  • the amount of discharged mud is adjusted by the operator outputting the pump P1 while monitoring the sludge interface meter (not shown), the sludge concentration meter 7 and the like. It should be noted that the amount of mud can be determined based on the amount of mud discharged per unit time (the rate of mud draining) empirically during the start-up process and based on the mud draining rate and the mud draining time. Good.
  • the position of the sludge interface S is monitored by a sludge interface meter installed in the settling tank 4, and the position of the sludge interface S is predetermined.
  • the separated sludge 11 may be discharged by the sludge pump P1 through the separated sludge supply line L5 and the sludge discharge line L6.
  • the sludge volume ratio As described above, it is possible to suppress a decrease in the ratio of the high-density sludge in the separated sludge 11 in the settling tank 4, and the generation of high-density sludge by an excessive amount of aggregated flocs. It becomes possible to suppress the delay. For this reason, according to the start-up method of the high-density sludge generation type water treatment device, it is possible to generate high-density sludge sufficiently in a short period of time, and as a result, the concentration of the high-density sludge can be increased in a short period of time. It becomes possible.
  • the main operation after startup can be performed at an early stage. If the sludge volume ratio in the sedimentation tank 4 is controlled so as to exceed 30 vol% of the volume, the high density sludge cannot be sufficiently produced in a short period of time, and it takes a significant time to increase the concentration of the high density sludge. It takes.
  • the sludge in the sludge accumulation process that is performed at an early stage in the start-up process, the sludge is once increased to a unified sludge amount (for example, 5 to 15 vol%), and then the high-density sludge generation process is performed.
  • a unified sludge amount for example, 5 to 15 vol%
  • sludge is taken in the sludge reforming tank 5, the first insolubilization treatment tank 1, the second insolubilization treatment tank 2 and the coagulation treatment tank 3 in the process of circulating the sludge in the high-density sludge generation step, and finally the sedimentation tank. Even if the amount of sludge returning to 4 is reduced, the amount of sludge necessary for producing high-density sludge can be secured.
  • the sludge volume ratio is preferably controlled to be 4 to 30 vol%, and more preferably 10 to 20 vol%.
  • the high-density sludge concentration can be sufficiently increased in a shorter period of time. That is, it is possible to start up the high-density sludge-generating water treatment device in a shorter period of time. As a result, the main operation after startup can be performed earlier.
  • the start-up process ends as described above.
  • whether or not the start-up process is completed depends on whether or not the generation of high-density sludge has been sufficiently performed.
  • generation of high density sludge was fully made changes with kinds of the inorganic type ion in the waste_water
  • the sludge concentration reaches a numerical value arbitrarily set within a range of 150 to 350 g / L (preferably 200 to 300 g / L), it is determined that the start-up process is completed.
  • the inorganic ions are Cu 2+ , Mn 2+ , Ni 2+ , Zn 2+ , these hardly increase the sludge concentration.
  • the sludge concentration reaches a value set arbitrarily within the range of 50 to 150 g / L (preferably 80 to 120 g / L), it is determined that the start-up process has been completed.
  • the criteria for determining whether high-density sludge has been sufficiently generated depending on the type of inorganic ions are due to differences in the ease of densification, that is, the ease of modification, depending on the inorganic ions. It is.
  • the reason for determining whether high-density sludge has been generated is based on the sludge concentration as follows. In other words, since it is difficult to confirm the sludge crystal structure and to dry the sludge at the site, instead of directly measuring the sludge density, measure the sludge concentration and make the sludge sufficiently dense based on the sludge concentration. This is because it is easier to determine the end of the startup process.
  • the main operation process is performed.
  • this operation process sufficiently high density sludge is generated in the separated sludge 11 of the settling tank 4.
  • the sludge volume ratio in the sedimentation tank 4 may be 30 vol% or less.
  • the sludge volume ratio in the settling tank 4 is usually 50 vol% or less.
  • the sludge volume ratio in this case is made the same as the sludge volume ratio in the starting process.
  • the high-density sludge generation type water treatment apparatus is configured such that the sludge reforming tank 5 is installed in a water treatment apparatus that does not have the sludge reforming tank 5 (hereinafter referred to as “existing water treatment apparatus”).
  • existing water treatment apparatus a water treatment apparatus that does not have the sludge reforming tank 5
  • the same or equivalent components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
  • the sludge reforming tank 5 When remodeling an existing water treatment device to a high-density sludge generation type water treatment device, the sludge reforming tank 5 is installed on the separated sludge supply line L5 while continuing the water treatment operation in the existing water treatment device. Is completed, the separated sludge 11 from the settling tank 4 is supplied to the sludge reforming tank 5, and the densification of the sludge is started. That is, the start-up process is started. At this time, the factory that supplied the wastewater to the existing water treatment apparatus is usually in a full operation state.
  • the flow rate of inorganic ion-containing wastewater discharged from the factory and the concentration of inorganic ions are increased, and a sufficient amount of separated sludge is also present in the sedimentation tank 4.
  • 11 is often present. Specifically, the separated sludge 11 is often present at a sludge volume ratio of 20 to 50 vol%.
  • this embodiment is different from the first embodiment in that the start-up process does not include the sludge accumulation process. That is, in this embodiment, control is started so that the said sludge volume ratio in the sedimentation tank 4 will be 30 vol% or less, without making sludge accumulate in the sedimentation tank 4.
  • FIG. when the sludge volume ratio in the settling tank 4 is larger than 30 vol% at the start of the start-up process, the sludge pump P1 is operated to reduce the sludge amount. And after the said sludge volume ratio reaches
  • the sludge pump P1 is operated as necessary to increase or decrease the amount of sludge. And after the said sludge volume ratio reaches
  • the present invention is not limited to the embodiment described above.
  • the aggregation processing tank 3 is provided in the said embodiment, the aggregation processing tank 3 can also be abbreviate
  • Example 1 The high-density sludge generation type water treatment apparatus shown in FIG. 1 was started up as follows. In addition, as a high-density sludge generation type water treatment apparatus, the thing in which the separation sludge 11 does not exist in the sedimentation tank 4, ie, the thing whose sludge volume ratio in the sedimentation tank 4 is 0% was used.
  • Al wastewater an aluminum wastewater having an aluminum ion concentration of 1000 mg / L (hereinafter referred to as “Al wastewater”) was introduced into the first insolubilization treatment tank 1 through an introduction line L1.
  • the pH value was adjusted by appropriately supplying sulfuric acid so that the pH value in the liquid in the first insolubilization treatment tank 1 was about 6.5.
  • the pH greatly varies in the first insolubilization treatment tank 1.
  • the discharged water from the 1st insolubilization processing tank 1 was introduced into the 2nd insolubilization processing tank 2 through the intermediate line L2.
  • the second insolubilization treatment tank 2 is appropriately supplied with caustic soda and sulfuric acid as pH adjustment agents from the pH adjustment agent supply tank 9 via the line L9, and the pH value in the liquid in the second insolubilization treatment tank 2 is 7 It adjusted so that it might become 0.0.
  • the discharged water from the second insolubilization treatment tank 2 was introduced into the aggregation treatment tank 3 via the intermediate line L3.
  • the coagulation treatment tank 3 was supplied with the polymer coagulant from the coagulant supply tank 10 via the line L10.
  • the discharged water from the flocculation treatment tank 3 was introduced into the precipitation tank 4 through the intermediate line L4, and was settled and separated into treated water and separated sludge in the precipitation tank 4.
  • the treated water was discharged from the settling tank 4 through the treated water discharge line L7. In this way, sludge was accumulated in the settling tank 4.
  • the sludge volume ratio was determined as follows. That is, first, the relationship between the volume of the in-tank liquid region R1 of the settling tank 4 and the position of the water surface of the in-tank liquid on the inner wall surface of the settling tank 4 is confirmed in advance. By confirming the position of the sludge interface S and the position of the liquid level L of the liquid in the tank, the sludge volume ratio was determined. The position of the sludge interface S in the separated sludge region R2 was confirmed by a sludge interface meter (not shown) installed in the settling tank 4.
  • sludge was first accumulated up to 10 vol%, and when the sludge volume ratio reached 10 vol%, a sludge circulation process, that is, a high-density sludge generation process was started.
  • the calcium hydroxide which is a counter ion containing material was introduce
  • the adsorbed sludge was supplied from the sludge reforming tank 5 through the adsorbed sludge supply line L11 to the first insolubilizing treatment tank 1, and the Al waste water and the adsorbed sludge were brought into contact with each other in the first insolubilizing treatment tank 1.
  • the aluminum ion in Al waste water was made to react with the hydroxide ion which is a counter ion of adsorption sludge, and was insolubilized.
  • the pH was adjusted by supplying sulfuric acid as a pH adjusting agent from the pH adjusting agent supply tank 8 via the line L8.
  • the discharged water from the first insolubilization treatment tank 1 was introduced into the second insolubilization treatment tank 2 through the intermediate line L2.
  • the second insolubilization treatment tank 2 was supplied with caustic soda and sulfuric acid as pH adjusters from the pH adjuster supply tank 9 via the line L9.
  • the discharged water from the second insolubilization treatment tank 2 was introduced into the aggregation treatment tank 3 via the intermediate line L3.
  • the coagulation treatment tank 3 was supplied with the polymer coagulant from the coagulant supply tank 10.
  • the discharged water from the flocculation treatment tank 3 was introduced into the precipitation tank 4 through the intermediate line L4, and was settled and separated into the treated water and the separated sludge 11 in the precipitation tank 4.
  • the treated water was discharged from the settling tank 4 through the treated water discharge line L7.
  • the high-density sludge was generated by repeating the above series of steps. On the other hand, after the sludge volume ratio reached 10 vol%, the mud was discharged in the settling tank 4 to reduce the sludge volume ratio in the settling tank 4 to 3 vol%.
  • the sludge was discharged in the settling tank 4, and the sludge was densified while controlling the sludge volume ratio to be 3 vol%.
  • the above-mentioned sludge volume ratio in the sedimentation tank 4 was determined as follows. That is, the relationship between the volume of the liquid in the tank introduced into the settling tank 4 and the position of the water surface of the liquid in the tank on the inner wall surface of the settling tank 4 is confirmed in advance, and based on this relationship, the separated sludge region in the liquid in the tank By confirming the position of the sludge interface S of R2 and the position of the liquid level L of the liquid area R1 in the tank, the sludge volume ratio, which is the volume ratio of the separated sludge area R2 in the liquid area R1 in the tank, was determined. .
  • the volume ratio of the sludge in the sedimentation tank 4 was controlled as follows. That is, the amount of mud was limited by adjusting the output of the mud pump P1, and the sludge volume ratio was set to the control target value. Moreover, using the sludge interface meter installed in the settling tank 4, the position of the sludge interface S was monitored, and it was confirmed that the position of the sludge interface S greatly deviated from the position where the sludge volume ratio was 3 vol%. In some cases, the amount of sludge discharged was adjusted manually.
  • Example 2 A high-density sludge-generating water treatment apparatus was started up in the same manner as in Example 1 except that the sludge volume ratio was controlled to 4 vol%.
  • Example 3 A high-density sludge-generating water treatment apparatus was started up in the same manner as in Example 1 except that the sludge volume ratio was controlled to be 6 vol%.
  • Example 4 After the sludge volume ratio reaches 10 vol%, the high-density sludge generation type water treatment device is started up in the same manner as in Example 1 except that the sludge volume ratio in the sedimentation tank 4 is controlled to be 10 vol%. It was.
  • Example 5 Even after the sludge volume ratio reached 10 vol%, the amount of sludge was continuously increased in the sedimentation tank 4, and after the sludge volume ratio in the sedimentation tank 4 reached 15 vol%, the sludge volume ratio was controlled to be 15 vol%. Except for this, a high-density sludge-generating water treatment device was started up in the same manner as in Example 1.
  • Example 6 After the sludge volume ratio reached 10 vol%, the amount of sludge was continuously increased in the sedimentation tank 4, and after the sludge volume ratio reached 20 vol%, the sludge volume ratio in the sedimentation tank 4 was controlled to be 20 vol%. Except for this, a high-density sludge-generating water treatment device was started up in the same manner as in Example 1.
  • Example 7 After the sludge volume ratio reached 10 vol%, the amount of sludge was continuously increased in the sedimentation tank 4, and after the sludge volume ratio reached 25 vol%, the sludge volume ratio in the sedimentation tank 4 was controlled to be 25 vol%. Except for this, a high-density sludge-generating water treatment device was started up in the same manner as in Example 1.
  • Example 8 After the sludge volume ratio reached 10 vol%, the amount of sludge was continuously increased in the sedimentation tank 4, and after the sludge volume ratio reached 30 vol%, the sludge volume ratio in the sedimentation tank 4 was controlled to be 30 vol%. Except for this, a high-density sludge-generating water treatment device was started up in the same manner as in Example 1.
  • the separated sludge 11 (sludge concentration C1) in the settling tank 4 was taken out every other day and placed in a measuring cylinder and allowed to stand for 24 hours.
  • the sludge concentration ratio R of the sludge was measured as the ratio of the sludge area capacity in the measuring cylinder (capacity of sludge area after 24 hours of standing / volume of sludge area before standing for 24 hours), and sludge after 24 hours of standing.
  • the sludge concentration C1 was measured with the sludge concentration meter 7.
  • the time until the sludge concentration C2 reached 300 g / L was measured. The results are shown in Table 1.
  • FIG. 3 is a graph showing the results of changes over time in the sludge concentration in the sedimentation tank 4 for Example 4 and Comparative Example 1.
  • the time required for the sludge concentration to reach 300 g / L is significantly shortened in the start-up methods of Examples 1 to 8, compared to the start-up methods in Comparative Examples 1 and 2.
  • FIG. That is, when the plot of Example 4 and the plot of Comparative Example 1 are compared, it can be seen that the plot of Example 4 and the plot of Comparative Example 1 are greatly separated over time from the start of measurement. From this, it is clear that the sludge concentration in Example 4 reaches 300 g / L in a short period of time compared with Comparative Example 1.
  • the same tendency as described above was observed for the periods reaching 150 g / L and 200 g / L.
  • the sludge concentration of 150 g / L is a sludge concentration that is a standard for sufficiently producing high-density sludge.
  • Example 9 The inorganic ion-containing waste water to be treated is changed from aluminum waste water to iron ion-containing waste water (iron ion (Fe 3+ ) concentration: 1000 mg / L), and the counter ion-containing substance supplied to the sludge reforming tank 5, iron
  • the counter ions that form insolubilized substances with ions, the pH in the first insolubilization treatment tank 1 and the pH in the second insolubilization treatment tank 2 are as shown in Table 2, and the sludge volume ratio in the sedimentation tank 4 is controlled to be 15 vol%.
  • a high-density sludge-generating water treatment device was started up in the same manner as in Example 5 except that.
  • Example 3 A high-density sludge-generating water treatment apparatus was started up in the same manner as in Example 9 except that the sludge volume ratio in the sedimentation tank 4 was controlled to be 35 vol%.
  • Example 10 The inorganic ion-containing wastewater to be treated is changed from aluminum wastewater to chromium ion-containing wastewater (chromium ion (Cr 2+ ) concentration: 1000 mg / L), and the counterion-containing substance, chromium, supplied to the sludge reforming tank 5
  • the counter ions that form insolubilized substances with ions, the pH in the first insolubilization treatment tank 1 and the pH in the second insolubilization treatment tank 2 are as shown in Table 2, and the sludge volume ratio in the precipitation tank 4 is controlled to be 13 vol%.
  • a high-density sludge-generating water treatment device was started up in the same manner as in Example 5 except that.
  • Example 4 A high-density sludge generating water treatment apparatus was started up in the same manner as in Example 10 except that the sludge volume ratio in the sedimentation tank 4 was controlled to be 33 vol%.
  • Example 11 The inorganic ion-containing wastewater to be treated is changed from aluminum wastewater to fluorine ion-containing wastewater (fluorine ion (F ⁇ ) concentration: 1000 mg / L), and the counterion-containing substance, fluorine supplied to the sludge reforming tank 5
  • the counter ions forming insolubilized substances with ions, the pH in the first insolubilization treatment tank 1 and the pH in the second insolubilization treatment tank 2 are as shown in Table 2, and the sludge volume ratio in the sedimentation tank 4 is controlled to be 10 vol%.
  • a high-density sludge-generating water treatment device was started up in the same manner as in Example 4 except that.
  • Example 5 A high-density sludge generation type water treatment apparatus was started up in the same manner as in Example 11 except that the sludge volume ratio in the sedimentation tank 4 was controlled to be 32 vol%.
  • Example 12 The inorganic ion-containing wastewater to be treated is changed from aluminum wastewater to phosphate ion-containing wastewater (phosphate ion (PO 4 2 ⁇ ) concentration: 1000 mg / L), and counter ions supplied to the sludge reforming tank 5
  • the contained substances, counter ions that form insolubilized substances with phosphate ions, pH in the first insolubilization treatment tank 1 and pH in the second insolubilization treatment tank 2 are as shown in Table 2, and the sludge volume ratio in the precipitation tank 4 is 10 vol%.
  • the high-density sludge generation type water treatment apparatus was started up in the same manner as in Example 4 except that the control was performed so that
  • Example 6 A high-density sludge generating water treatment apparatus was started up in the same manner as in Example 12 except that the sludge volume ratio in the sedimentation tank 4 was controlled to be 33 vol%.
  • Example 13 The inorganic ion-containing wastewater to be treated is changed from aluminum wastewater to sulfate ion-containing wastewater (sulfate ion (SO 4 2 ⁇ ) concentration: 1000 mg / L), and the counter ion-containing substance supplied to the sludge reforming tank 5
  • the pH in the first insolubilization treatment tank 1 and the pH in the second insolubilization treatment tank 2 are as shown in Table 2 and the counter ion forming an insolubilized product with sulfate ions so that the sludge volume ratio in the sedimentation tank 4 is 10 vol%.
  • the high-density sludge generation type water treatment apparatus was started up in the same manner as in Example 4 except that the control was performed.
  • the separated sludge 11 (sludge concentration C1) in the settling tank 4 was taken out every other day and placed in a measuring cylinder and allowed to stand for 24 hours.
  • the sludge concentration ratio R of the sludge was measured as the ratio of the sludge area capacity in the measuring cylinder (capacity of sludge area after 24 hours of standing / volume of sludge area before standing for 24 hours), and sludge after 24 hours of standing.
  • the sludge concentration C1 was measured with the sludge concentration meter 7.
  • the time until the sludge concentration C2 reached 300 g / L was measured. The results are shown in Table 2.
  • FIG. 4 is a graph showing the results of the change in sludge concentration in the sedimentation tank 4 with respect to Example 9 and Comparative Example 3
  • FIG. 5 is the result of time with respect to the sludge concentration in the sedimentation tank 4 with respect to Example 10 and Comparative Example 4.
  • FIG. 6 is a graph showing the results of changes
  • FIG. 6 is a graph showing the results of changes in sludge concentration over time in the sedimentation tank 4 for Example 11 and Comparative Example 5
  • FIG. 7 is a sedimentation tank for Examples 12 and Comparative Example 6.
  • FIG. 8 is a graph showing the results of the change over time in the sludge concentration in the settling tank 4 for Example 13 and Comparative Example 7.
  • FIG. 8 is a graph showing the results of the change over time in the sludge concentration in the settling tank 4 for Example 13 and Comparative Example 7.
  • Fe wastewater, Cr drainage, F drainage, PO 4 drainage that can be performed in a short period of time for the launch of SO 4 wastewater processing target to a high density sludge generated type water treatment device confirmed.
  • Example 14 The inorganic ion-containing wastewater to be treated is changed from aluminum wastewater to copper ion-containing wastewater (copper ion (Cu 2+ ) concentration: 1000 mg / L), and the counter ion-containing substance supplied to the sludge reforming tank 5, copper Except that the counter ions forming insolubilized substances with ions, the pH in the first insolubilization treatment tank 1 and the pH in the second insolubilization treatment tank 2 are as shown in Table 3, and the sludge volume ratio is controlled to be 12 vol%. In the same manner as in Example 5, a high-density sludge-generating water treatment apparatus was started up.
  • Example 15 The inorganic ion-containing waste water to be treated is changed from aluminum waste water to manganese ion-containing waste water (manganese ion (Mn 2+ ) concentration: 1000 mg / L), and the counter ion-containing substance supplied to the sludge reforming tank 5, manganese Except that the counter ions forming insolubilized substances with ions, the pH in the first insolubilization treatment tank 1 and the pH in the second insolubilization treatment tank 2 are as shown in Table 3, and the sludge volume ratio is controlled to be 12 vol%. In the same manner as in Example 5, a high-density sludge-generating water treatment apparatus was started up.
  • Example 16 The inorganic ion-containing waste water to be treated is changed from aluminum waste water to nickel ion-containing waste water (nickel ion (Ni 2+ ) concentration: 1000 mg / L), and the counter ion-containing substance supplied to the sludge reforming tank 5, nickel
  • the counter ions forming insolubilized substances with ions, the pH in the first insolubilization treatment tank 1 and the pH in the second insolubilization treatment tank 2 are as shown in Table 3, and the sludge volume ratio in the sedimentation tank 4 is controlled to be 12 vol%.
  • a high-density sludge-generating water treatment device was started up in the same manner as in Example 5 except that.
  • Example 17 The inorganic ion-containing wastewater to be treated is changed from aluminum wastewater to zinc ion-containing wastewater (zinc ion (Zn 2+ ) concentration: 1000 mg / L), and the counterion-containing substance and zinc supplied to the sludge reforming tank 5
  • the counter ions forming insolubilized substances with ions, the pH in the first insolubilization treatment tank 1 and the pH in the second insolubilization treatment tank 2 are as shown in Table 3, and the sludge volume ratio in the sedimentation tank 4 is controlled to be 12 vol%.
  • a high-density sludge-generating water treatment device was started up in the same manner as in Example 5 except that.
  • the separated sludge 11 (sludge concentration C1) in the settling tank 4 was taken out every other day and placed in a measuring cylinder and allowed to stand for 24 hours.
  • the sludge concentration ratio R is measured as the ratio of the volume of the sludge area in the graduated cylinder (volume of the area after standing for 24 hours / volume of the sludge area before standing for 24 hours), and the sludge concentration after standing for 24 hours.
  • FIG. 10 is a graph showing the results of changes in sludge concentration over time in the sedimentation tank 4 for Example 14 and Comparative Example 9
  • FIG. 11 is the results of changes in the sludge concentration over time in the precipitation tank 4 for Example 15 and Comparative Example 10.
  • FIG. 12 is a graph showing the results of changes in the sludge concentration in the sedimentation tank 4 over time for Example 17 and Comparative Example 11.
  • the start-up of the high-density sludge-generating water treatment apparatus that treats Cu wastewater, Mn wastewater, Ni wastewater, and Zn wastewater can be performed in a short period of time.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Treatment Of Sludge (AREA)
  • Removal Of Specific Substances (AREA)
  • Water Treatment By Sorption (AREA)
PCT/JP2011/056477 2010-03-18 2011-03-17 高密度汚泥生成型水処理装置の立上げ方法 WO2011115230A1 (ja)

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JPH10479A (ja) * 1996-06-12 1998-01-06 Kurita Water Ind Ltd フッ素除去装置
JP2006272121A (ja) * 2005-03-29 2006-10-12 Kurita Water Ind Ltd 水処理装置の立ち上げ方法
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JP2010089047A (ja) * 2008-10-10 2010-04-22 Japan Organo Co Ltd 凝集沈殿装置

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JP2910346B2 (ja) * 1991-08-29 1999-06-23 栗田工業株式会社 重金属含有廃水の処理方法
JP3256606B2 (ja) * 1993-09-20 2002-02-12 日新製鋼株式会社 高密度汚泥処理方法および装置
JP3463493B2 (ja) * 1997-01-17 2003-11-05 栗田工業株式会社 凝集沈殿装置
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JPH07241572A (ja) * 1994-03-07 1995-09-19 Kurita Water Ind Ltd 金属含有排水の処理方法
JPH10479A (ja) * 1996-06-12 1998-01-06 Kurita Water Ind Ltd フッ素除去装置
JP2006272121A (ja) * 2005-03-29 2006-10-12 Kurita Water Ind Ltd 水処理装置の立ち上げ方法
WO2008120704A1 (ja) * 2007-03-30 2008-10-09 Kurita Water Industries Ltd. フッ素含有排水の処理装置および処理方法
JP2010089047A (ja) * 2008-10-10 2010-04-22 Japan Organo Co Ltd 凝集沈殿装置

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